Google lets you see a list of advertisers bidding on your keyword:
http://www.google.com/sponsoredlinks

I’ve just istalled the “Google Sitemap” plugin for WordPress and submitted the sitemap to Google. Let’s see if Google will index this site faster.
Sitemap is a must have for hard-to-crawl sites. This site does not seem to have any problems with crawlers. However, it’s always interesting to learn new tools.
For more information, see Google Sitemaps [...]

People will tell you what they think about your software but they seldom tell software developers what they think about their competitors.
If you don’t know your competitors, you cannot find your position in the market. I constantly monitor Usenet newsgroups for competitors’ names, their product names, URLs, our product names. Moreover, when users ask [...]